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argarcia255
09.10.2019 •
Mathematics
What does cde most specifically describe?
a. a minor arc
b. a major arc
c. a semicircle
d. a chord
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Ответ:
B) tan (150)=tan(180-30)=-tan30=
C) cos (-135)=cos (135)=cos (180-45)=-cos (45)=
D) sec (300)=sec (360-60)=sec(60)=2 (It lies on fourth quadrant where sec is +ve)
E) sin (240)=sin(180-(-60))=sin(-60)=-sin (60)=
(It lies on third quadrant where sin is -ve)
F) cos (330)=cos(360-30)=cos(30)=
(It lies on fourth quadrant where cos is +ve)
sin (240)- cos (330)=